Senior Full-Stack Developer partnering with startups, founders, and global agencies to turn complex ideas into high-performance, production-ready software.
4+ Yrs
Engineering Exp
20+
Delivered Projects
100%
On-time Milestones
Next.js 14 / React
SSR • Edge Cache • Tailwind
Node.js / Golang
REST • GraphQL • WebSockets
PostgreSQL / Redis
ACID • PubSub • Migrations
AWS / Docker / Vercel
CI/CD • Zero Downtime • SSL
Trusted by founders & teams across the US, UK, Europe & Australia
Active overlap with US (EST/PST), UK (GMT), EU (CET), AU (AEST)
Direct Slack/Linear updates, Loom demos & clear documentation
Strict TypeScript, automated CI/CD & atomic GitHub pull requests
Full codebase ownership, secure credentials & strict confidentiality
Real-world software built for global clients and startups. Every project demonstrates tangible business impact, robust architecture, and clean craftsmanship.
Full-stack AI platform with automated workflows, real-time generation & distributed cloud storage.
99.9%
Uptime
<140ms
API Latency
Cloud-Native
Architecture
Technologies Deployed:
Secure global payment integration, multi-currency credit system & WCAG international accessibility.
100%
Payment Success
WCAG AA
Accessibility
5.0 ★
User Feedback
Technologies Deployed:
Git-backed content management system with lightning-fast static generation and markdown workflows.
100/100
Lighthouse Score
0.4s
Page Load
$0/mo
Maintenance
Technologies Deployed:
Custom bakery catalog, dynamic cart management & instant direct order fulfillment flow.
+320%
Mobile Orders
-45%
Bounce Rate
High
Conversion
Technologies Deployed:
Bespoke engineering portfolio designed for high-conversion international freelance client acquisition.
99/100
Core Web Vitals
Bespoke
Design System
Worldwide
Global Reach
Technologies Deployed:
Let's discuss how we can engineer a custom solution for your business.
From greenfield architecture to scaling existing systems. Direct senior engineering execution with no agency layers, no bloated timelines, and zero compromise on code quality.
Ideal For:
Startups and companies needing high-performance, custom web platforms.
How we turn your idea into production-ready software. Predictable milestones, zero surprise costs, and clear asynchronous communication at every stage.
Deep dive into your product vision, target market, functional requirements, and business goals to eliminate assumptions.
Designing the complete technical blueprint: database schemas, API specs, cloud topology, and UI/UX state management flows.
High-velocity development using clean TypeScript. Frequent staging releases with async video demos to keep you in the loop.
Comprehensive testing for performance, security, and edge-cases. Optimizing load times to guarantee sub-second latency.
Zero-downtime deployment to global cloud infrastructure with automated CI/CD, SSL encryption, and analytics telemetry.
Post-launch warranty, ongoing feature development, infrastructure scaling, and proactive technical partnership.
Curated technologies chosen for stability, scalability, and developer velocity. Every tool in this stack is backed by hands-on production experience.
App Router, SSR, Edge runtime, server actions & SEO
Complex state machines, custom hooks, reusable design systems
End-to-end type safety, generic utilities, zero 'any' policy
Responsive design systems, design tokens, sleek animations
Micro-interactions, layout transitions & scroll animations
Predictable multi-tenant global state management
Event-driven asynchronous APIs, microservices & tooling
High-throughput microservices & ultra-low latency endpoints
AI model orchestration, async data processors & workers
Idempotent endpoints, rate limiting, OpenAPI specifications
Schema design, Apollo Federation & client cache resolution
Enterprise backend architecture with clean dependency injection
Relational modeling, complex queries, connection pooling, ACID
In-memory caching, distributed locks, BullMQ queueing & PubSub
Document schema design, aggregation pipelines & replica sets
Type-safe ORM migrations, schema synchronization
ECS, S3, RDS, CloudFront CDN, Route53 DNS & IAM security
Multi-stage container builds, local dev parity & orchestration
Custom RAG pipelines, function calling, embeddings & streaming
Automated linting, test execution & zero-downtime deployment
Edge network delivery & cost-optimized S3-compatible cloud storage
Tech Stack Philosophy: Pick the simplest, most reliable technology that solves the business challenge with high velocity and zero unnecessary dependencies.
I don't just write code — I build production-grade software that helps businesses acquire users, process payments reliably, and scale without technical bottlenecks.
SDTechWorld was established in 2020 as a modern freelance software engineering studio. Over the past 4+ years, we have partnered with ambitious founders and enterprise leaders worldwide, delivering over 20+ production web applications, SaaS MVPs, and complex payment systems across Europe, North America, and global markets.
Having collaborated directly with startup founders and enterprise leaders (such as Manuel Pierre Garnier at Brand-To-Product in Europe), we understand that clients need more than just syntax — they need a reliable freelance engineering partner who communicates clearly, respects deadlines, and takes full ownership of outcomes.
Whether architecting a distributed AI web app with Next.js & Python or securing multi-currency payment workflows, SDTechWorld focuses on sub-second performance, strict type safety, and robust maintainability.
I evaluate the business goal, user retention impact, and ROI before choosing architecture, avoiding over-engineering.
Rapid 2-week sprint cycles with strict TypeScript, modular components, and comprehensive automated test suites.
Clear daily updates on Slack/Linear, recorded Loom walkthroughs, and atomic GitHub pull requests. Zero guesswork.
Full IP ownership, thorough documentation, and clean handoff. You own 100% of your source code and infrastructure.
4+ Yrs
Shipping Code
20+
Global Deliveries
5.0 ★
Client Rating
Real feedback from international founders, CEOs, and technical teams who have partnered with me for critical software deliveries.
CEO & Founder
Brand-To-Product
"I had the pleasure of working with Smit as a freelance software engineer, and I highly recommend him. He is professional, clear in his communication, and always takes the time to explain what will be done so there are no surprises along the way. On brand-to-product.com, Smit was instrumental in implementing the payment system, ensuring accessibility, and making the platform fully responsive. What impressed me most is how carefully he listens to the customer's needs and adapts his approach accordingly. He's also pragmatic and flexible, able to find effective solutions that fit within the available budget without compromising quality."
"Smit delivered our platform ahead of schedule with exceptional quality. His expertise in Next.js, TypeScript, and frontend performance is top-notch. Our page load speed dropped by 60% after his architecture refactor."
CEO & Co-Founder • TechStream
"Working with Smit was a breeze. He translated our complex business requirements into a simple, beautiful, and resilient interface. He communicates asynchronously without needing constant oversight."
Founder & Product Lead • GreenLabs
"Excellent technical execution and clear communication. Smit helped us migrate legacy services to modern Node.js and PostgreSQL with zero downtime and comprehensive test suites."
Head of Engineering • CloudScale
Clear answers to common questions about international remote collaboration, payment terms, code ownership, and timelines.
I'm currently accepting new freelance contracts and consulting projects. Tell me about your requirements, timeline, and goals below.
